抄録
We studied the optical interactions of femtosecond surface plasmon polariton (SPP) wavepackets with a
nano-scaled metal-insulator-metal (MIM) cavity using finite-difference time-domain (FDTD) simulations
and time-frequency analyses. The resonance nature of the interaction between the SPP and the
cavity provides transmitted and reflected SPP wavepackets with spectra whose envelope shapes are
strongly modulated by the cavity eigenmodes. Because of the cavity’s properties as a Fabry-Pérot etalon,
when the instantaneous carrier frequency of the incident wavepacket matches the eigenmode, that
portion is clipped and released as a transmitted wavepacket while the other portion is reflected. With appropriate
eigenmode tuning, a wavepacket can be extracted with a narrower time duration and a temporally
shifted intensity peak.
